新能源并网比例的不断攀升降低了电力系统惯量,导致系统调频能力下降.为此,开展了储能参与调频的研究.储能参与调频受到单元数量、荷电状态(state of charge,SOC)、充放电策略等因素影响,提出一种考虑频率死区的储能单元协同控制策略,根据SOC 一致性对储能单元进行分组,不同组别单独执行下垂控制或虚拟惯量控制,简化出力控制指令.依据系统频率偏差或频率变化率进行控制指令切换,并分别设置频率偏差和频率变化率死区,以减少小扰动干扰导致储能系统频率充放电.基于Matlab/Simulink进行仿真验证,结果表明:所提控制策略简单便于执行,能够快速响应调频需求,并且能保证储能电池使用寿命.
Cooperative Control Strategy of Energy Storage Unit Considering Frequency Dead Zone
The continuous increase in the proportion of new energy grid connection has reduced the inertia of the power system,leading to a decrease in system frequency regulation capability.In response to this issue,research on the participation of energy storage in frequency regulation has been carried out.The participation of energy storage in frequency regulation is influenced by factors such as unit quantity,state of charge(SOC),and charge-discharge strategy.A coordinated control strategy for energy storage units considering frequency deadband is proposed.Energy storage units are grouped based on SOC consistency,and different groups independently execute droop control or virtual inertia control to simplify output control commands.Control command switching is based on system frequency deviation or frequency rate of change,with frequency deviation and rate-of-change deadbands set to reduce disturbances causing frequent charging and discharging of energy storage systems.Simulation verification using Matlab/Simulink shows that the proposed control strategy is simple to implement,can quickly respond to frequency regulation requirements,and can ensure the lifespan of energy storage batteries.
energy storage unit groupingfrequency regulation dead zonepositive and negative virtual inertia controlcooperative controlbattery life
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